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Tier 2 Assessment

The purpose of Tier 2 assessment is to collect additional site-specific data and, with the use of Tier 2 fate and transport modeling, determine what actual and potential receptors could be impacted by chemicals of concern.

A Tier 2 Site assessment must be conducted and a Site Cleanup Report submitted for all sites when any of the following conditions occur:

  • Free phase petroleum product is present at the site.
  • The site owner or tank owner/operator has decided to bypass the Tier 1 assessment and go directly to the Tier 2 assessment phase.
  • A pathway has failed the Tier 1 assessment.
  • During drilling, bedrock was encountered before groundwater.
  • Explosive vapor levels were measured during a Tier 1 assessment or recent investigation of the site.

Tier 2 Guidance along with software will help you to fill out the assessment report.

Tier 2 Version 2.51 and SMR Software Installation Instructions

Please note the Tier 2-SMR v2.51 User’s Manual and executable files are large documents and may take some time to download from the web site.  If you would like a CD copy of Version 2.51, contact Dawn Santa Maria at 515-281-8865 or Dawn.SantaMaria@dnr.iowa.gov.

  1. Create a new directory on your hard disk and label it "T2SMRInstallV251".
  2. Download the files tier2smrv251exe to the directory.  (Save the files to your new directory).
  3. Locate the files in windows explorer.  These files are self-extracting zip files.  As a precaution, scan the files for viruses if you have antivirus software.
  4. Double click on the software file (tier2smrv251exe.exe). This will open the WinZip® Self-Extractor dialog box.  Type the location, where you wish to save the file, in the Unzip to Folder: text box or browse to the location by using the Browse... button.
  5. Click on the Unzip button and extract the installation files to the directory. Click on the Close button to close the WinZip® Self-Extractor dialog box.  There will be three installation files:
    • setup.exe
    • Setup.lst
    • T2SMRV251.CAB
  6. Double click on setup.exe. This will start up the installation program for Tier 2-SMR Version 2.51.  After installation the program will be shown in the "Start", "Programs" as Tier 2-SMR V2.51

Tier 2 Software – Version 3.00 Installation Instructions

Please note the Tier 2-SMR v3.00 executable files may take some time to download from the web site.  If you would like a CD copy of Version 2.51, contact Dawn Santa Maria at 515-281-8865 or Dawn.SantaMaria@dnr.iowa.gov.

For new leaking underground storage tank sites undergoing the Iowa risk based corrective action process that results in a Tier 2 Site Cleanup Report needing to be completed, the Tier 2 Software Version 3.00 should be used.  This does not apply to non-granular bedrock and granular bedrock sites. This is effective May 22, 2010.

Instructions for downloading from the web site are provided below. These instructions are specific to those who have already completed the download / install process for v2.51 of the software.

  1. Create a folder on your hard drive C: and name it T2Ver3.
  2. Double click on the zipped file tier2ver3 and save the file Tier 2 v3_00 Run Time 01-18-10 to the T2Ver3 folder on your hard drive.
  3. Locate the files in Windows Explorer.  These files are self-extracting zip files.  As a precaution, scan the files for viruses if you have antivirus software.
  4. In the folder Tier 2 v3_00 Run Time 01-18-10, you will find the file, T2SMRV3_00.exe
  5. Double click on the executable file (T2SMRV3_00.exe) and you will be prompted to Extract all files from the compressed folder or Run the program.
  6. At this point, choose Run, and the Version 3.00 software will open and is ready for use.
  7. To create a shortcut on your desktop, right click on T2SMRV3_00.exe and select Send To, Desktop (create shortcut).  The Tier 2 Version 3 software will run from here.

Note that you are able to open files created under v.2.51.  The user input parameters will remain the same from previous versions (K, Sw, W, groundwater flow direction, etc.).  However, the output (i.e., specifically RID plumes and SSTLs) will change based on the recalibrated version of the model.  You will need to review the output information generated from v.3.00 to determine what modifications need to be made (check RID plumes, SSTLs, candidate monitoring wells to see if those selected still meet criteria for S, T,G, etc).  

Please reference the associated Risk Based Tier 2 Software Model v.3.00 Guidance, and Model Transition Rules for guidance on when it is appropriate to use the new model.  When you save project files for submittal to DNR using v3.00, please include the LUST number, date, and v3 in the name of the files being saved (e.g., 9lta04SMRv3_022410.tv2) 

Documents & Guidance

For new leaking underground storage tank sites undergoing the Iowa risk based corrective action process that results in a Tier 2 Site Cleanup Report needing to be completed, the Tier 2 Software Version 3.00 should be used.  This does not apply to non-granular bedrock and granular bedrock sites. This is effective May 22, 2010.


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